Which of the following reactions results in a change in the hybridization state of the central atom — Chemical Bonding Chemistry Question

💡 Solution & Explanation

In $BF_3$, the central Boron is $sp^2$ hybridized (trigonal planar with an empty p-orbital). When it accepts a lone pair from $F^-$ to form a coordinate bond in $BF_4^-$, it utilizes that empty orbital, transitioning to an $sp^3$ hybridized state (tetrahedral). In the other reactions, the central atom's hybridization ($sp^3$) remains unchanged.